Answer:
3 * (x + 7)
Step-by-step explanation:
Mark number as x
Then the sum of a number and seven is x + 7
Three times x + 7 can be written as
3 * (x + 7)
Parentheses mean that we first add x and 7 and then multiply their sum by 3
Alternatively you can write it as 3x + 21, since
3 * (x + 7) = 3 * x + 3 * 7 = 3x + 21
Answer:
I believe the solution of the system of equations in (5,-7)
Step-by-step explanation:
Answer:
5.
Step-by-step explanation:
![\frac{5x+3}{6}-x=\frac{6x-2}{6}-5;](https://tex.z-dn.net/?f=%5Cfrac%7B5x%2B3%7D%7B6%7D-x%3D%5Cfrac%7B6x-2%7D%7B6%7D-5%3B)
![\frac{-x+3}{6} =\frac{6x-32}{6};](https://tex.z-dn.net/?f=%5Cfrac%7B-x%2B3%7D%7B6%7D%20%3D%5Cfrac%7B6x-32%7D%7B6%7D%3B)
7x=35; ⇔ x=5.